title: Comparative testing of 5 nicotine systems: initial use and preferences.
mesh_terms: D002638:Chewing Gum; D018592:Cross-Over Studies; D004333:Drug Administration Routes; D005260:Female; D006801:Humans; D008297:Male; D009538:Nicotine / Q000008:administration & dosage* / Q000627:therapeutic use; D016540:Smoking Cessation / Q000379:methods* / Q000523:psychology; D013375:Substance Withdrawal Syndrome; D011795:Surveys and Questionnaires; D013607:Tablets; D014029:Tobacco Use Disorder / Q000188:drug therapy*
chemical_list: D002638:Chewing Gum; D013607:Tablets; D009538:Nicotine